Sheet securing and retaining device



Dec. 14, 1943. c s 2,336,933

SHEET SECURING AND RETAINING DEVICE Filed Oct. 6, 1941 INVENTOR. JAM5 R. H/CKS Patented Dec. 14, 1943 sscname AND RETAINING nevi-cs Pia-mes Hicks, Waterbury, Conn, assignor to "are The Bristol Company, Waterbury, Conn, a corporation of Connecticut Applicatiei @ctoher 6, Iii-i1, Serial No. 413,768

1 Claim.

arbor embodying the principles of the invention, and having a record chart secured thereto.

2 is a similar View of the same in a position for placing or removing the chart.

Referring now to the drawing:

The numeral iii designates a slightly tapered spindle such as commonly forms a part of the timing element of a recording instrument of the circular chart type. Mounted upon the It is a further object to provide such a device spindle 553 is a hub element li formed either of having a deformable element adapted to exmetal or of a ri id plastic such as Bakelite, pand into operative engagement with an openand having a tapered interior bore to fit the ing perforated in a sheet or chart to be so sespindle l6 whereby said hub element may be cured, truly centered and caused to rotate With the It is a further object to provide such a device spindle. The hub element ll includes a project- Which may be fabricated substantially of noning and slightly tapered boss 52 and a threaded metallic material flange part i3, having a flat annular surface por- It is a further object to provide such a device tion i l. The outside diameter of the fiange it which Will be simple in construction, inexpensive and of the surface [4 is made considerably to manufacture, easy to install and manipulate, greater than that of the central opening in the ornamental in appearance, and durable in use. chart with which it is desired that the arbor be While this invention is applicable to a wide used. variety of uses Where an element of mechanism A deformable dome-shaped member l5, formed or a portion of flat material is to be secured in of rubber or other similarly resilient material, is temporary engagement with a fiat surface, it is 2 provided with an internal surface to fit closely described herein in its especial application to about the boss l2 of the hub element ii and at the securing of a record sheet to the chart-drivits open end terminates in an annular flat suring element of a recording instrument of the face to enga e t e cflrlcsponding Surface M o circular-record type. said hub element. The outer surface of the The conventional form of circular-chart re- 33 me be 518 p e erab y ormed to a slig cording instrument comprises a spindle which is cal taper and at part of its length axially redriven, usually at a constant speed, by a clock moved from said flat surface has, when unor other timing mechanism. Carried by this stressed, a normal diameter slightly greater spindle is an arbor having a, projecting boss 19- than the central opening in the chart With Which signed to lit a corresponding opening pierced in the device is to be used. the center of a record chart of paper or similar The portion of the member which includes material. A clamping element in the form of a the fiat surface adaptable to engagement with nut adapted to en age a threaded portion of the the surfa e is is for ed into a fla e Of boss, or a lever element, or Similar mechanism, ameter substantially equivalent to that of the is pmvided for the purpose of forcing the chart 4:; flange 53 and adapted to be pressed into intimate into definite engagement with the arbor whereby engagement therewith- The portion of the n; will be positively rotated therew 'h, and yet f i5 remote from t flange i$ I11'OVid-ed readily removable when the record is completed. m which may c0I Wen1ent1y be Typical mountings of these types are fully set Wlth h fi for stressing the memforth and described in U. S. Letters Patent No. ,f an axla' r 1,48 861 dated December 1923 and U. Ql.-. mpmg of the flange io Of the member s into lntimate engagement with the surface it Letters Patent No. 2,155 817 dated April 25 1931 1 a s b m F a n 7 I H m i J ontoenange 5.. 1s eifected by means of a 1mg lseuvd to pQllcants aselgnee- *hese and i navmg an inwardly progecting flange I!) bearother chart mountings are usually fabricated ona fiat annular u f e adapted to be Opposed i y of metal, embodying a considerable numto the surface it Kvith the flange l5 interposed. her of p t n eq iring more or less precision An internally threaded portion on the ring l8 machine work in their construction. engages the thread on the flange l3, permitting In the drawing: the flange E6 of the member IE to be securely Fig. 1 is a View, partially in section, of a chart gripped between the opposed flat annular surfaces. The ring it is provided with an annular plane surface 29 adapted to form a bearing for the chart 2! with which the device is to be used, and is also provided with an internal bore of diameter equal to, or slightly greater than, that of the opening in the chart.

Th method of use of the chart arbor i as follows: when it is desired to place a record sheet upon the arbor, a chart 2!, having a centrally located opening of predetermined diameter, is placed over the dome-shaped resilient member l5, the knob l1 grasped with the fingers and the element it; placed under a certain degree of tension as indicated by the arrows A, Fig. 2;. This will stretch the material of the side walls of the member i5 with a corresponding slight decrease in diameter throughout its length, as indicated at B in Fig. 2. The chart 2| may then he slipped over the member [5 into intimate engagement with the annular surface 29 of the clamping ring 58. Upon release of the knob I1, the natural resiliency of the member 15 will cause it to resume its former shape, the normal expansion of the side walls increasing the overall diameter to an extent that both the central opening in the chart 2! and the bore of the ring i8 are fully engaged by said member 55. The edge of said central opening in the chart is. thus firmly gripped by said member l5, so that the chart is thereby clamped in its operating position as shown in Fig. 1. When it is desired to remove the chart, it is necessary only to apply a slight tension on the knob l1, stretching the element l5, and decreasing its diameter sufficiently to allow the chart to slip freely off the arbor.

The terms and expression which I have employed are used as terms of description and not of limitation, and I have no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described or portions thereof, but recognize that various modifications are possible within the scope of the invention claimed.

I claim:

In a recording instrument having a shaft adapted to rotate a centrally perforated circular chart, the combination of a hub member secured to said shaft, an annular member adapted tobe secured to said hub in clamping relationship, and having a face portion for supporting said chart, a resiliently extensible element adapted when in an extended condition to pass freely into the perforation in said chart but when not so extended to grip the interior edge of said perforation, said hub member and said annular member having cooperating portions in overlapping relation for clamping engagement with a portion of said extensible element at one side of said chart, said extensible element projecting beyond said members, and having at its free end a knob portion adapted to be grasped by an operator to extend said element.

JAMES R. HICKS. 

